Polypropylene, a type of thermoplastic polymer, is inherently not flame retardant. It has a relatively low melting point (160-170°C) and can ignite at temperatures around 570°F (300°C). However, it's worth noting that it can be made flame retardant through the addition of chemical flame retardants or by compounding it with other materials that enhance its resistance to flames. These modifications are essential in applications where fire safety is a concern, such as in construction materials, automotive parts, and electrical components. Manufacturers often tailor the flame resistance of polypropylene to meet specific safety standards required for different applications.

As a chemical element. titanium is made from nothing but titanium. Its symbol in the periodic table is Ti and its atomic number is 22.

Loosening PVC cement, once it has cured, is notoriously difficult because the cement chemically fuses the PVC materials together, creating a permanent bond. In essence, the pieces are no longer separate but have become one. However, if you need to separate PVC pipes or fittings after the cement has set, you might have limited options. Heating the joint with a heat gun or hair dryer can sometimes soften the PVC enough to allow some manipulation, but caution is required to avoid damaging the material or causing injury. Cutting the PVC is often the most viable option, using a saw or pipe cutter, and then replacing the affected section. Always ensure safety measures are in place, including wearing protective gear and working in a well-ventilated area.